PENNSYLVANIA R. CO. v. DAY. The Oyez Project at IIT Chicago-Kent College of Law. 12 February 2012. <http://www.oyez.org/cases/1950-1959/1958/1958_397>.
PENNSYLVANIA R. CO. v. DAY, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1950-1959/1958/1958_397 (last visited February 12, 2012).
"PENNSYLVANIA R. CO. v. DAY," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 12, 2012, http://www.oyez.org/cases/1950-1959/1958/1958_397.